Hi guys. Just here to say I've got the exact same problem as you all do.
I have a H100i RGB. Spent hours and hours debugging this, changing cables, removing software, BIOS settings and reinstalling windows. It was seriously driving me nuts. Very happy I found this thread and happy to read that Corsair is working on a fix for this ASAP.
This is a very serious issue and I'm on the fence whether to return this unit or not. I hope this can be resolved in the next release.
Also, information about this should be put up on your site so people are aware and don't have to spend hours on this for no use.